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-   -   MPG DROPPING.... :( (https://www.scionlife.com/forums/scion-xa-xb-1st-gen-drivetrain-power-1638/mpg-dropping-201132/)

FL21289 03-29-2011 12:15 AM
MPG DROPPING.... :(
 
Hey guys another question; lately on my Scion Xa 05 i have been wasting double the amount of gas that i normally do.

I don't know what it is but its kinda of ____ing me off $36 a week is not cool i used to be able to do that in 2 weeks tops. I changed spark plugs last year around this time.... Tires have air on them perfect, there balance and all. I have an intake and filter is washed and clean. Oil only has about 2k on it and its syntactic. I ran out of ideas on what could be causing this..... Any help or suggestions will help greatly guys.

Thanks,:cry:
FL

mystik 03-29-2011 02:56 AM
did you change your driving habit? do you now drive more in the city than on the highway? how about weight? are you carrying a lot of things in the car?

2009xbtx 03-29-2011 03:40 AM
i read somewhere that the more ethinal they put in the gas the lower your avg mpg will be. could be the reason

tC_Crisis 03-29-2011 04:07 AM
Keep in mind about " winter gas "

jct 03-29-2011 09:39 AM
clean you maf sensor change your PVC valve... and go on a diet

Scratch 03-29-2011 01:15 PM
^^ and when did you 'clean' the filter? Was it an oil based cleaning system? Some oil may have gotten on the MAF Sensor, give it a cleaning with CRC cleaner or something to that effect.

Intake a SRI or CAI? Any more traffic than usual? Gas from a different station that usual?

FL21289 04-01-2011 03:33 AM
Hey guys nope driving habits stayed the same nothing changed. I will clean the MAF this weekend but i cleaned it a few months ago... :( and for intake i have a SRI which i clean the filter with water yearly as well... weird. Ill keep you posted thanks again all!

frogbox 04-01-2011 03:46 AM
Originally Posted by FL21289 (Post 3808708)
Hey guys another question; lately on my Scion Xa 05 i have been wasting double the amount of gas that i normally do.

I don't know what it is but its kinda of ____ing me off $36 a week is not cool i used to be able to do that in 2 weeks tops. I changed spark plugs last year around this time.... Tires have air on them perfect, there balance and all. I have an intake and filter is washed and clean. Oil only has about 2k on it and its syntactic. I ran out of ideas on what could be causing this..... Any help or suggestions will help greatly guys.

Thanks,:cry:
FL
You said you changed your plugs last year? Didn't say Iridiums, but I would think it's about time to check em, replace em , check the gap on em. Won't get into which plugs are best , but they might need checking anyway , they do weird things sometimes.

burstaneurysm 04-01-2011 05:24 AM
Originally Posted by jct (Post 3809007)
clean you maf sensor change your PVC valve... and go on a diet
PCV, Johnny. :biggrin:

jct 04-01-2011 12:13 PM
eh i was on the right track

FL21289 04-02-2011 12:51 AM
Originally Posted by jct (Post 3809007)
clean you maf sensor change your PVC valve... and go on a diet
Checking Plugs tomorrow and replacing them if needed... But also wanted to replace PCV as it only cost $6 in my local shop; but where is this located on teh XA guys???

jct 04-02-2011 02:42 PM
follow the vent hose from the air intake tube to the valve cover

FL21289 04-16-2011 12:59 AM
Late Update guys.

But i replaced the Spark Plugs which were pretty much dirty. And also replaced the PCV valve which was also dirty like from oil or something.

Boy what a difference those 2 parts did, feel like i got my power and gas back once again.

Thanks you all like always for the help ;)

stellarhavoc 05-20-2011 10:40 PM
Did you check your engine motor mounts? If they're worn and you're engine shakes when rev'd in N (as a test)... it's a waste of power/mpg.


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